Add `LLVM::Builder#finalize` #12035

Job	Run time
check_format	1m 44s
deploy_api_docs	0s
x86_64-gnu-test (1.7.3)	35m 0s
x86_64-gnu-test (1.8.2)	34m 19s
x86_64-gnu-test-preview_mt	5m 40s
x86_64-musl-test	35m 25s
x86_64-gnu-test (1.9.2)	35m 12s
x86_64-gnu-test (1.10.1)	32m 55s
x86_64-gnu-test (1.11.2)	34m 10s
x86_64-gnu-test (1.12.2)	33m 38s
x86_64-gnu-test (1.13.1)	34m 2s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	33m 27s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	35m 6s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	36m 8s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	35m 35s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	38m 19s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	33m 26s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	32m 45s
	8h 46m 51s

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